Coulometry
| Formula / Notation | Q = ∫I dt; n = Q/(nF) |
|---|---|
| Also Known As | Coulometric analysis, controlled-potential coulometry, constant-current coulometry |
What is Coulometry?
Coulometry is an electroanalytical method that measures the quantity of charge (in coulombs) required to completely convert an analyte from one oxidation state to another. Using Faraday's law, the number of moles of analyte can be calculated from the charge. Coulometry can be performed at constant potential (potentiostatic) or constant current (galvanostatic).
Formula & Notation
Other Names / Synonyms: Coulometric analysis, controlled-potential coulometry, constant-current coulometry
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Coulometry is an electroanalytical method that measures the quantity of charge (in coulombs) required to completely convert an analyte from one oxidation state to another. Using Faraday's law, the number of moles of analyte can be calculated from the charge. Coulometry can be performed at constant potential (potentiostatic) or constant current (galvanostatic).
Coulometry is used in Karl Fischer water determination (trace moisture analysis in pharmaceuticals and petroleum), in coulometric standardisation of reagent solutions, in pollution monitoring (oxygen demand), and in corrosion measurement. It provides a primary analytical standard without needing cal…
Coulometric cells may use toxic reagents (Karl Fischer reagent contains iodine, SO₂, pyridine — all irritants or toxic). Generated gases (H₂, Cl₂) must be vented appropriately. High-current coulometric systems present electrical hazards.
The formula or notation for Coulometry is: Q = ∫I dt; n = Q/(nF)